Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca705ab460ca6194…

MALICIOUS

PDF

92.4 KB Created: 2021-06-05 18:32:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: cc391b6ba16aef7fd8b50b7be73a4e8b SHA-1: dbf1aa672f98eb9310b3a380072df56124bd628d SHA-256: ca705ab460ca619470f4eebe4bc56d3a0dc76f85104784ee154828c1d4ca331c
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://medvor.ru/pbw?utm_term=how+to+find+maximum+speed+in+circular+motion PDF link annotation
    • https://jopomewimedadi.weebly.com/uploads/1/3/4/4/134465277/33a3d63a8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501364/normal_6001ca6009319.pdfIn PDF document text
    • https://sidedelozamuk.weebly.com/uploads/1/3/1/4/131482822/8999314.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412403/normal_60677246015f5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475729/normal_600e2ea857ef5.pdfIn PDF document text
    • https://vekukexulijoj.weebly.com/uploads/1/3/4/3/134397774/3730182.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466366/normal_5fc836db4588a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379605/normal_5ffdca80036ce.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458856/normal_602c91bbdc32f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402481/normal_5fe80a29cbfd2.pdfIn PDF document text
    • https://maremuwalivode.weebly.com/uploads/1/3/4/6/134632863/5429002.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://viluxese.pbworks.com/f/70439460042.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6c027a9f-de78-47d4-b271-fd6c3a9b0d7f/56748321909.pdfIn PDF document text
    • http://faxamom.pbworks.com/f/12646732892.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/daa71cff-67d6-4bf7-9b36-a53ca58a63a8/tawamosapa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a81147b2-828d-4d66-b6b3-f4ff0413dbf2/ghost_in_the_machine_bob_meaning.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d43a735f-63fa-4d8b-b291-eccb1bc68b4b/conclusion_sobre_titulos_y_operaciones_de_credito.pdfIn PDF document text
    • http://kuzimotum.pbworks.com/f/96079372432.pdfIn PDF document text
    • http://pukagij.pbworks.com/f/livre_pour_apprendre_le_piano.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/32b516a2-8b9e-4d5c-9a93-93f20ba20ced/luneta.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c8b1bcf9-499b-4d30-9271-e2087f3ae930/fokilob.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a01f7ca7-cd83-44c7-a27d-384db98f9aab/2011_honda_odyssey_owners_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8e10a257-f38b-482c-aeba-7423722dd556/zufaviz.pdfIn PDF document text
    • http://siruzosu.pbworks.com/f/how_does_implied_volatility_affect_option_prices.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011bbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BBC 5304 bytes
SHA-256: 2f8e7be3f0fe5feabdd8d685e48f9488bbe55c80e3d62ef7e71a404c40b436b2
font_01_sfnt_off00012dbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DBB 11584 bytes
SHA-256: bc068a1b9b0c37a4d7cf6a995383eae2f964587bf0d8ff468a9d623bfd7cf5b2
font_02_sfnt_off00015569.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15569 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333